Motor-starter switch.



W. S. EVANS. MOTOR STARTER SWITCH.

- APPLIGATION IILED DEC. 30, 1910. 1,009,229, Patented Nov. 21, 1911.

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WITNESSES INVENTOR W v 1 1512711005; WW; v I I Al 0mg W. S. EVANS.

MOTOR STARTER SWITCH. APPLICATION FILED Dm'so, 1910.

1,009,229. Patented N0v.21, 1911.

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Wyw v [NZ E1VTOR 72 M 1 1% $.Evana v v A M 41 WILLIAM S. EVANS, OFNEWARK, NEW JERSEY.

MOTOR-STARTER SWITCH.

Specification of Letters Patent. Patented NOV. 21 1911.

Application filed December 30, 1910. Serial No. 600,148.

'0 all whom it may concern: Be it known that I, WILLIAM S. EVANS, acitizen of the United States of America, and resident of Newark, in thecounty of Essex and State of New Jersey, have invented certain new anduseful Improvements in M0- tor-Starter Switches, of which the followis aspecification. v y invention relates to that class of device in whichstarting resistances are automatically short circuited, w n the motorhas reached normal speed, combined with means for effecting a quickoverload release.

Figure 1 is an elevation of the device when in operation. Fig. 2 is aside view of Fig. 1. Fig. 3 is an elevation of a detail. Fig. 4 is adiagram of the circuits through the controller in one of its positions,the motor, and the magnets 19 and 20. The electric connections are thesame as those that occur in the device as shown in Fig. 1. Fig. 5 is adiagram of the circuits through the controller in its other position,the motor, and the magnets 19 and 20. The circuits and connections areas they exist when the controller is in the position seen in Fig. 3. Toprevent confusion, parts of the blades 11 are broken off, to moreclearly exhibit the circuits. One blade is seen in contact with theterminal 28, which always lies in the path of the said blade. The Y typeof induction motor is indicated.

The organization consists of starting resistances R R R in circuit withthe line whose terminals are respectively L L L and with a motor whoseterminals are M M M a three pole doubly acting switch, whose blades are11; a springlO for holding said switch closed while short ci-rcuitinsaid resistances, a pawl 16, engaged with a pin 17 on the switch forholding said switch open against the force of said spring; a shunt coil26; a core 20 for said coil, for releasing said pawl and switch forshort circuiting said resistances, and for cutting out said shunt coilat the contact 28, which is in the path of the left hand blade 11, andwhich is one terminal of the coil 26; a second three pole doubly actingswitch whose blades are 13; a spring 14 for opening said second switch;a second pawl 22 engaging the pin 23 on the second switch, for holdingthe second switch closed; a series coil 19; a core 20 and pin 21 forreleasing said second pawl, and opening the second switch at an overloadof current; pivot studs 29 common to both switches; said pin 17 on thefirst switch being in the path of the pawl 16 pivoted on the secondswitch, by which the two switches are joined together when the secondswitch is released from its closed condition.

Below the core 20, and in its path, is a rod 24, which extends upwardand is provided with a hook 31 reaching over one end of the pawl 16forvtilting the latter and releasin the pin 17 on the right hand blade11. The pawl 16 is pivoted to the right hand blade 13 so that when theblades 13 are swung open, the pawl 16 will engage with the pin 17 on oneof the blades 11. i

To operate the invention, pull thehandle 18 'whose blades are 13 untilthey engage the terminals L L U; the current is now free to passthroughthe blades -.13, and the resistances R R R and the series coil19, which pulls the cord 20 up, which strikes against the pin 21, whichtrips the pawl 22 on the stud 23, but the hand prevents the blades 13from rising. As the motor speeds up and drops in current and increasesin voltage, the coil ,19 loses its strength, and the coil 26 becomesstronger, pulling the core 20 down, striking the bar 24:, therebyreleasing the pawl 16 when the motor has attained a certain speed, andreleasing the switch whose blades are 11, for short {circuiting theresistances R R and R to obtain full speed. The motor is thus put acrossthe line,

so that the hand can be removed from the handle 18. The coil 19 thena'c'ts as a circuit breaker for on an overload the core 20 trips thepawl 22, again, causing the blades 13 to cut out the lines at theterminals L L L The stud 23 serves also as "a pivot for the pawl 16.

31 is a pivot for the pawl 22, which is fastened to the base of theswitch. One ter-,

minal of the coil 26 is at 28, while the other is at the resistance R.

I claim as my invention 1. In a three phase induction motor starter, thecombination of a starting resistance in circuit with said motor, ashuntcoil, means released by said coil for short circuiting saidresistance at starting speed or half speed, and for simultaneouslycutting out said shunt coil, a series'coil, and means released by said.series coil for cutting out said motor on an overload.

2. In a three phase induction motor starter, the combination of astarting resistance in circuit with said motor; a three pole doublyacting switch; a spring for closed; a series coil, a core therefor forreclosing said switch; a pawl holding said leasing said pawl and openingsaid second switchopen against the force of said spring; switch duringan overload, studs upon which a shunt coil; a core therefor, forreleasing both switches are swung, and means by said pawl and switch forshort circuiting which both switches are held together in 1 saidresistance and for cutting out said shunt their normal condition.

coil, at starting speed or half speed of said WILLIAM S. EVANS. motor; asecond three pole doubly acting switch, a spring for opening saidswitch, a second pawl for holding said second switch Witnesses:

HENRY SCI-IERIL, ARTHUR M. CoNDrr.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

